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Filtration is a part of the water treatment process in which colloidal and suspended material are removed from water by passing through layers of porous media like sand, foam, or fabric. After a while, these dirt materials build up in or on the surface of the media, so the filter needs to be cleaned. This is usually done through backwashing, sending clean water backwards through the filter medium to dislodge particles. Here are two examples of conventional filtration plants in Honduras:
Santa Rosa Water Filtration Plant
San Pedro de Tutule FIME Plant
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